Download App

3. Chemical kinetics — Chemistry STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceChemistry3. Chemical kinetics1 Mark
MCQ
A catalyst increases the rate of reaction because it
  • A
    Increases the activation energy
  • ✓
    Decreases the energy barrier for reaction
  • C
    Decreases the collision diameter
  • D
    Increases the temperature coefficient
✓

Answer

Correct option: B.
Decreases the energy barrier for reaction
b
It’s obvious.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q (1 Marks)" from 3. Chemical kinetics→3. Chemical kinetics — all question types→Chemistry STD 12 Science question papers→CBSE Board STD 12 Science question papers→CBSE Board question paper generator→

Similar questions

Which of the following order of given properties is incorrect
→
Which reaction is not feasible ?
→
Which of the following is  $\text{NOT}$ a condensation method?
→
When $E_{A{g^ + }/Ag}^o = 0.8$volt and $E_{Z{n^{2 + }}/Zn}^o = - 0.76\,$ volt, which of the following is correct
→
In the reaction shown below, the major product$(s)$ formed is/are
→
An acidified manganate solution undergoes disproportionation reaction. The spin-only magnetic moment value of the product having manganese in higher oxidation state is $....\,B.M.$ (Nearest integer)
→
Reimer-Tiemann reaction introduces an aldehyde group, on to the aromatic ring of phenol, ortho to the hydroxyl group. This reaction involves electrophilic aromatic substitution. This is a general method for the synthesis of substituted salicyladehydes as depicted below.

$Image$

$1.$ Which one of the following reagents is used in the above reaction?

$(A)$ aq. $\mathrm{NaOH}+\mathrm{CH}_3 \mathrm{Cl}$

$(B)$ aq. $\mathrm{NaOH}+\mathrm{CH}_2 \mathrm{Cl}_2$

$(C)$ aq. $\mathrm{NaOH}+\mathrm{CHCl}_3$

$(D)$ aq. $\mathrm{NaOH}+\mathrm{CCl}_4$

$2.$ The electrophile in this reaction is

$(A)$ : $\mathrm{CHCl}$ $(B)$ ${ }^{+} \mathrm{CHCl}_2$

$(C)$ $\mathrm{CCl}_2$ $(D)$. $\mathrm{CCl}_3$

$3.$ The structure of the intermediate $I$ is

$Image$

Give the answer question $1, 2$ and $3.$

→
$E\xleftarrow{{KOH/Br_2}}D\xleftarrow[\begin{subarray}{l} 
  {\text{Partial}} \\ 
  {\text{Hydorlysis}} 
\end{subarray} ]{{{H_2}{O_2}/O{H^ - }}}C\xleftarrow{{NaCN}}{C_2}{H_5} - Cl\xrightarrow{{AgCN}}A\xrightarrow{{LiAl{H_4}}}B$

What is relationship between $'\,B\,'$ and $'\,E\,'$ ?

→
Which of the ligands can show linkage isomerism :
→
The amine formed from an amide by means of bromine and alkali has
→